It seems to be an issue with the file format or a possible drm issue. I've installed 1.50 today and the issue is still there. I also cleaned my Mac and removed all other DLNA server applications I've tried over the years.
It's an odd issue. When I try to any file from my iTunes or iPhoto library on my PS3 through PS3 Media Server it gives DLNA errors. When I browser the physical path with PMS to the music, movies or photo's I cannot enter the folder that holds the mp3, m4v or .jpg.